Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire according to our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 8 is an end view taken along line 8-8 in FIG. 7.

Broken lines are used to show portions of the tire that are not being claimed, and thus form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 